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Browse Source 
Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
This commit is contained in:
Alex Ellis (OpenFaaS Ltd)
2019-12-20 12:56:11 +00:00
parent 9a30ff517f
commit 5c45242b3d
1379 changed files with 633020 additions and 0 deletions
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1
vendor/github.com/containerd/fifo/.gitignore generated vendored Normal file
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coverage.txt

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vendor/github.com/containerd/fifo/.travis.yml generated vendored Normal file
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language: go
go:
- 1.11.x
- tip
install:
- go get -u github.com/vbatts/git-validation
- go get -u github.com/kunalkushwaha/ltag
before_script:
- pushd ..; git clone https://github.com/containerd/project; popd
script:
- DCO_VERBOSITY=-q ../project/script/validate/dco
- ../project/script/validate/fileheader ../project/
- make deps
- make fmt
- make vet
- make test
after_success:
- bash <(curl -s https://codecov.io/bash)

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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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vendor/github.com/containerd/fifo/Makefile generated vendored Normal file
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# Copyright The containerd Authors.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
.PHONY: fmt vet test deps
test: deps
go test -v -race -covermode=atomic -coverprofile=coverage.txt ./...
deps:
go get -d -t ./...
fmt:
gofmt -s -l .
vet:
go vet ./...

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vendor/github.com/containerd/fifo/errors.go generated vendored Normal file
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fifo
import (
"errors"
)
var (
ErrClosed = errors.New("fifo closed")
ErrCtrlClosed = errors.New("control of closed fifo")
ErrRdFrmWRONLY = errors.New("reading from write-only fifo")
ErrReadClosed = errors.New("reading from a closed fifo")
ErrWrToRDONLY = errors.New("writing to read-only fifo")
ErrWriteClosed = errors.New("writing to a closed fifo")
)

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vendor/github.com/containerd/fifo/fifo.go generated vendored Normal file
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fifo
import (
"io"
"os"
"runtime"
"sync"
"syscall"
"github.com/pkg/errors"
"golang.org/x/net/context"
)
type fifo struct {
flag int
opened chan struct{}
closed chan struct{}
closing chan struct{}
err error
file *os.File
closingOnce sync.Once // close has been called
closedOnce sync.Once // fifo is closed
handle *handle
}
var leakCheckWg *sync.WaitGroup
// OpenFifo opens a fifo. Returns io.ReadWriteCloser.
// Context can be used to cancel this function until open(2) has not returned.
// Accepted flags:
// - syscall.O_CREAT - create new fifo if one doesn't exist
// - syscall.O_RDONLY - open fifo only from reader side
// - syscall.O_WRONLY - open fifo only from writer side
// - syscall.O_RDWR - open fifo from both sides, never block on syscall level
// - syscall.O_NONBLOCK - return io.ReadWriteCloser even if other side of the
// fifo isn't open. read/write will be connected after the actual fifo is
// open or after fifo is closed.
func OpenFifo(ctx context.Context, fn string, flag int, perm os.FileMode) (io.ReadWriteCloser, error) {
if _, err := os.Stat(fn); err != nil {
if os.IsNotExist(err) && flag&syscall.O_CREAT != 0 {
if err := mkfifo(fn, uint32(perm&os.ModePerm)); err != nil && !os.IsExist(err) {
return nil, errors.Wrapf(err, "error creating fifo %v", fn)
}
} else {
return nil, err
}
}
block := flag&syscall.O_NONBLOCK == 0 || flag&syscall.O_RDWR != 0
flag &= ^syscall.O_CREAT
flag &= ^syscall.O_NONBLOCK
h, err := getHandle(fn)
if err != nil {
return nil, err
}
f := &fifo{
handle: h,
flag: flag,
opened: make(chan struct{}),
closed: make(chan struct{}),
closing: make(chan struct{}),
}
wg := leakCheckWg
if wg != nil {
wg.Add(2)
}
go func() {
if wg != nil {
defer wg.Done()
}
select {
case <-ctx.Done():
select {
case <-f.opened:
default:
f.Close()
}
case <-f.opened:
case <-f.closed:
}
}()
go func() {
if wg != nil {
defer wg.Done()
}
var file *os.File
fn, err := h.Path()
if err == nil {
file, err = os.OpenFile(fn, flag, 0)
}
select {
case <-f.closing:
if err == nil {
select {
case <-ctx.Done():
err = ctx.Err()
default:
err = errors.Errorf("fifo %v was closed before opening", h.Name())
}
if file != nil {
file.Close()
}
}
default:
}
if err != nil {
f.closedOnce.Do(func() {
f.err = err
close(f.closed)
})
return
}
f.file = file
close(f.opened)
}()
if block {
select {
case <-f.opened:
case <-f.closed:
return nil, f.err
}
}
return f, nil
}
// Read from a fifo to a byte array.
func (f *fifo) Read(b []byte) (int, error) {
if f.flag&syscall.O_WRONLY > 0 {
return 0, ErrRdFrmWRONLY
}
select {
case <-f.opened:
return f.file.Read(b)
default:
}
select {
case <-f.opened:
return f.file.Read(b)
case <-f.closed:
return 0, ErrReadClosed
}
}
// Write from byte array to a fifo.
func (f *fifo) Write(b []byte) (int, error) {
if f.flag&(syscall.O_WRONLY|syscall.O_RDWR) == 0 {
return 0, ErrWrToRDONLY
}
select {
case <-f.opened:
return f.file.Write(b)
default:
}
select {
case <-f.opened:
return f.file.Write(b)
case <-f.closed:
return 0, ErrWriteClosed
}
}
// Close the fifo. Next reads/writes will error. This method can also be used
// before open(2) has returned and fifo was never opened.
func (f *fifo) Close() (retErr error) {
for {
select {
case <-f.closed:
f.handle.Close()
return
default:
select {
case <-f.opened:
f.closedOnce.Do(func() {
retErr = f.file.Close()
f.err = retErr
close(f.closed)
})
default:
if f.flag&syscall.O_RDWR != 0 {
runtime.Gosched()
break
}
f.closingOnce.Do(func() {
close(f.closing)
})
reverseMode := syscall.O_WRONLY
if f.flag&syscall.O_WRONLY > 0 {
reverseMode = syscall.O_RDONLY
}
fn, err := f.handle.Path()
// if Close() is called concurrently(shouldn't) it may cause error
// because handle is closed
select {
case <-f.closed:
default:
if err != nil {
// Path has become invalid. We will leak a goroutine.
// This case should not happen in linux.
f.closedOnce.Do(func() {
f.err = err
close(f.closed)
})
<-f.closed
break
}
f, err := os.OpenFile(fn, reverseMode|syscall.O_NONBLOCK, 0)
if err == nil {
f.Close()
}
runtime.Gosched()
}
}
}
}
}

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vendor/github.com/containerd/fifo/handle_linux.go generated vendored Normal file
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// +build linux
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fifo
import (
"fmt"
"os"
"sync"
"syscall"
"github.com/pkg/errors"
)
const O_PATH = 010000000
type handle struct {
f *os.File
fd uintptr
dev uint64
ino uint64
closeOnce sync.Once
name string
}
func getHandle(fn string) (*handle, error) {
f, err := os.OpenFile(fn, O_PATH, 0)
if err != nil {
return nil, errors.Wrapf(err, "failed to open %v with O_PATH", fn)
}
var (
stat syscall.Stat_t
fd = f.Fd()
)
if err := syscall.Fstat(int(fd), &stat); err != nil {
f.Close()
return nil, errors.Wrapf(err, "failed to stat handle %v", fd)
}
h := &handle{
f: f,
name: fn,
dev: uint64(stat.Dev),
ino: stat.Ino,
fd: fd,
}
// check /proc just in case
if _, err := os.Stat(h.procPath()); err != nil {
f.Close()
return nil, errors.Wrapf(err, "couldn't stat %v", h.procPath())
}
return h, nil
}
func (h *handle) procPath() string {
return fmt.Sprintf("/proc/self/fd/%d", h.fd)
}
func (h *handle) Name() string {
return h.name
}
func (h *handle) Path() (string, error) {
var stat syscall.Stat_t
if err := syscall.Stat(h.procPath(), &stat); err != nil {
return "", errors.Wrapf(err, "path %v could not be statted", h.procPath())
}
if uint64(stat.Dev) != h.dev || stat.Ino != h.ino {
return "", errors.Errorf("failed to verify handle %v/%v %v/%v", stat.Dev, h.dev, stat.Ino, h.ino)
}
return h.procPath(), nil
}
func (h *handle) Close() error {
h.closeOnce.Do(func() {
h.f.Close()
})
return nil
}

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vendor/github.com/containerd/fifo/handle_nolinux.go generated vendored Normal file
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// +build !linux
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fifo
import (
"syscall"
"github.com/pkg/errors"
)
type handle struct {
fn string
dev uint64
ino uint64
}
func getHandle(fn string) (*handle, error) {
var stat syscall.Stat_t
if err := syscall.Stat(fn, &stat); err != nil {
return nil, errors.Wrapf(err, "failed to stat %v", fn)
}
h := &handle{
fn: fn,
dev: uint64(stat.Dev),
ino: uint64(stat.Ino),
}
return h, nil
}
func (h *handle) Path() (string, error) {
var stat syscall.Stat_t
if err := syscall.Stat(h.fn, &stat); err != nil {
return "", errors.Wrapf(err, "path %v could not be statted", h.fn)
}
if uint64(stat.Dev) != h.dev || uint64(stat.Ino) != h.ino {
return "", errors.Errorf("failed to verify handle %v/%v %v/%v for %v", stat.Dev, h.dev, stat.Ino, h.ino, h.fn)
}
return h.fn, nil
}
func (h *handle) Name() string {
return h.fn
}
func (h *handle) Close() error {
return nil
}

25
vendor/github.com/containerd/fifo/mkfifo_nosolaris.go generated vendored Normal file
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// +build !solaris
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fifo
import "syscall"
func mkfifo(path string, mode uint32) (err error) {
return syscall.Mkfifo(path, mode)
}

27
vendor/github.com/containerd/fifo/mkfifo_solaris.go generated vendored Normal file
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// +build solaris
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fifo
import (
"golang.org/x/sys/unix"
)
func mkfifo(path string, mode uint32) (err error) {
return unix.Mkfifo(path, mode)
}

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vendor/github.com/containerd/fifo/raw.go generated vendored Normal file
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// +build go1.12
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fifo
import (
"syscall"
)
// SyscallConn provides raw access to the fifo's underlying filedescrptor.
// See syscall.Conn for guarentees provided by this interface.
func (f *fifo) SyscallConn() (syscall.RawConn, error) {
// deterministic check for closed
select {
case <-f.closed:
return nil, ErrClosed
default:
}
select {
case <-f.closed:
return nil, ErrClosed
case <-f.opened:
return f.file.SyscallConn()
default:
}
// Not opened and not closed, this means open is non-blocking AND it's not open yet
// Use rawConn to deal with non-blocking open.
rc := &rawConn{f: f, ready: make(chan struct{})}
go func() {
select {
case <-f.closed:
return
case <-f.opened:
rc.raw, rc.err = f.file.SyscallConn()
close(rc.ready)
}
}()
return rc, nil
}
type rawConn struct {
f *fifo
ready chan struct{}
raw syscall.RawConn
err error
}
func (r *rawConn) Control(f func(fd uintptr)) error {
select {
case <-r.f.closed:
return ErrCtrlClosed
case <-r.ready:
}
if r.err != nil {
return r.err
}
return r.raw.Control(f)
}
func (r *rawConn) Read(f func(fd uintptr) (done bool)) error {
if r.f.flag&syscall.O_WRONLY > 0 {
return ErrRdFrmWRONLY
}
select {
case <-r.f.closed:
return ErrReadClosed
case <-r.ready:
}
if r.err != nil {
return r.err
}
return r.raw.Read(f)
}
func (r *rawConn) Write(f func(fd uintptr) (done bool)) error {
if r.f.flag&(syscall.O_WRONLY|syscall.O_RDWR) == 0 {
return ErrWrToRDONLY
}
select {
case <-r.f.closed:
return ErrWriteClosed
case <-r.ready:
}
if r.err != nil {
return r.err
}
return r.raw.Write(f)
}

44
vendor/github.com/containerd/fifo/readme.md generated vendored Normal file
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### fifo
[![Build Status](https://travis-ci.org/containerd/fifo.svg?branch=master)](https://travis-ci.org/containerd/fifo)
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Go package for handling fifos in a sane way.
```
// OpenFifo opens a fifo. Returns io.ReadWriteCloser.
// Context can be used to cancel this function until open(2) has not returned.
// Accepted flags:
// - syscall.O_CREAT - create new fifo if one doesn't exist
// - syscall.O_RDONLY - open fifo only from reader side
// - syscall.O_WRONLY - open fifo only from writer side
// - syscall.O_RDWR - open fifo from both sides, never block on syscall level
// - syscall.O_NONBLOCK - return io.ReadWriteCloser even if other side of the
// fifo isn't open. read/write will be connected after the actual fifo is
// open or after fifo is closed.
func OpenFifo(ctx context.Context, fn string, flag int, perm os.FileMode) (io.ReadWriteCloser, error)
// Read from a fifo to a byte array.
func (f *fifo) Read(b []byte) (int, error)
// Write from byte array to a fifo.
func (f *fifo) Write(b []byte) (int, error)
// Close the fifo. Next reads/writes will error. This method can also be used
// before open(2) has returned and fifo was never opened.
func (f *fifo) Close() error
```
## Project details
The fifo is a containerd sub-project, licensed under the [Apache 2.0 license](./LICENSE).
As a containerd sub-project, you will find the:
* [Project governance](https://github.com/containerd/project/blob/master/GOVERNANCE.md),
* [Maintainers](https://github.com/containerd/project/blob/master/MAINTAINERS),
* and [Contributing guidelines](https://github.com/containerd/project/blob/master/CONTRIBUTING.md)
information in our [`containerd/project`](https://github.com/containerd/project) repository.